diff --git a/include/class.staff.php b/include/class.staff.php
index 7e74fe9651562c43449014972eef08e71377c4ff..165cce5bc2bdf7b774759cd372eb97908472adbf 100644
--- a/include/class.staff.php
+++ b/include/class.staff.php
@@ -780,7 +780,7 @@ implements AuthenticatedUser {
                 .' WHERE isadmin=1 and isactive=1';
             if (($res = db_query($sql))
                     && (list($count, $sid) = db_fetch_row($res))) {
-                if ($count == 1 && $sid = $id) {
+                if ($count == 1 && $sid == $uid) {
                     $errors['isadmin'] = __(
                         'Cowardly refusing to remove or lock out the only active administrator'
                     );